FXOS8700CQ datasheet(63/86 Pages) FREESCALE

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Sensors

Freescale Semiconductor, Inc.

9.13

Accelerometer offset correction

The 8-bit 2’s complement offset correction registers are used to realign the zero-g position of the X, Y, and Z axes after device

board mount. The resolution of the offset registers is 2 mg per LSB, with an effective offset adjustment range of -256 mg to +254

mg for each axis.

For more information on how to calibrate the 0g offset, please refer to Freescale application note AN4069.

9.13.1

OFF_X (0x2F) register

9.13.2

OFF_Y (0x30) register

9.13.3

OFF_Z (0x31) register

Table 83. Time step for PULSE detection window @ ODR and power mode LPF_EN = 1

ODR (Hz)

Max time range (s)

Time step (ms)

Normal

LPLN

High

resolution

Low power

Normal

LPLN

High

resolution

Low power

800

0.318

1.25

400

0.318

0.638

1.25

2.5

200

0.638

0.318

1.276

2.5

1.25

100

1.276

0.318

2.56

1.25

2.56

0.318

5.1

1.25

12.5

2.56

10.2

0.318

20.4

1.25

6.25

2.56

20.4

0.318

40.8

1.25

160

1.56

2.56

81.6

0.318

163.2

320

1.25

640

Figure 78. OFF_X register

off_x[7:0]

0b00000000

Table 84. OFF_X bit description

Field

Description

off_x[7:0]

X-axis offset correction value expressed as an 8-bit 2's complement number.

off_y[7:0]

0b00000000

Figure 79. OFF_Y register

Table 85. OFF_Y bit description

Field

Description

off_y[7:0]

Y-axis offset correction value expressed as an 8-bit 2's complement number.

off_z[7:0]

0b00000000

Figure 80. OFF_Z register

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